structural steel design plate girders
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Structural Steel DesignPlate Girders
Dr. Seshu Adluri
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Plate girders -Dr. Seshu Adluri
Plate Girders
Deep girdersThree platesWelded or boltedRolled sections not enoughUsually 3’-20’ deepWWF sections in the handbook can be usedWeb buckling
stiffenersVariable c/s
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Plate girders -Dr. Seshu Adluri
Plate girder stiffeners
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Plate girders -Dr. Seshu Adluri
Plate Girders
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Plate girders -Dr. Seshu Adluri
Plate Girders
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Plate girders -Dr. Seshu Adluri
Plate Girders
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Plate girders -Dr. Seshu Adluri
Bridge girders
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Plate girders -Dr. Seshu Adluri
Beams in Bridges
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Plate girders -Dr. Seshu Adluri
Beams in Bridges
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Plate girders -Dr. Seshu Adluri
Plate girders
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Plate girders -Dr. Seshu Adluri
Fabrication
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Plate girders -Dr. Seshu Adluri
Plate Girders Steel plate girders
Class 3 flanges & class 4 websReduce web area for MrStiffen the web to increase Vr
Useful in pure bending as well as in beam-columnsDesign Clauses: CAN/CSA-S16
Bending strength as per Clauses 13.6 & 7Shear strength as per Clause 13.4 Local buckling check: Clause 11 (Table 2)Special provisions: Clause 14Deflection limits: Appendix D
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Plate girders -Dr. Seshu Adluri
Plate buckling
Different types of buckling depending on
b/t ratio Webs and flanges have different limitsend conditions for plate segmentsUse Table 2 for beams and beam-columns
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Plate girders -Dr. Seshu Adluri
Slender webs buckle easily due to shear or bending
Use reduced effective c/s
orUse reduced capacity
Plate Girders
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Plate girders -Dr. Seshu Adluri
Slender webs buckle easily due to shear or bending
Plate Girders
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Plate girders -Dr. Seshu Adluri
Web buckling
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Plate girders -Dr. Seshu Adluri
Plate Girders
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Plate girders -Dr. Seshu Adluri
Plate Girders
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Plate girders -Dr. Seshu Adluri
Stiffeners are Important
June 1970, Milford Haven bridge over the River Cleddau in the UK
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Plate girders -Dr. Seshu Adluri
Plate Girders
Recall compression field action in reinforced concrete beams
Compression struts develop because of the presence of stirrups
Plate girder tension field action develops because of the placement of vertical (and horizontal) stiffeners